1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
EleoNora [17]
3 years ago
10

30 students in 8 grade finished their summer packet before august 15th. this was 12 percent of all the students. how many studen

ts are in 8 grade

Mathematics
1 answer:
marysya [2.9K]3 years ago
7 0
The total number of students is 250 from the solution in the image.

You might be interested in
What is 8 divided by 4
Gennadij [26K]
2 because u divide 8 by 4 and u get the answer 2
8 0
3 years ago
Read 2 more answers
Chris built a rectangular snow fort with a perimeter of 24 feet. The length of the fort was 8 feet less than 3 time the width. W
ipn [44]
-Make variables
-Write equation given using variables
-Plugin the equation for L with 2w to solve for W.
-plugin W value to solve for L

8 0
3 years ago
I'd appreciate it if anyone could help ASAP. I'm giving Brainliest!
n200080 [17]

Answer:

(1, 0.25)

Step-by-step explanation:

To find when f(x)=g(x), then look for a value that is the same for both functions in the table. 0.25 occurs twice for the same x value. This is when they are equal. The solution is (1, 0.25).

7 0
3 years ago
Are the marks one receives in a course related to the amount of time spent studying the subject? To analyze this mysterious poss
sertanlavr [38]

Answer:

a) 98.522

b) 0.881

c) The correlation coefficient and co-variance shows that there is positive association between marks and study time. The correlation coefficient suggest that there is strong positive association between marks and study time.

Step-by-step explanation:

a.

As the mentioned in the given instruction the co-variance is first computed in excel by using only add/Sum, subtract, multiply, divide functions.

Marks y Time spent x y-ybar x-xbar (y-ybar)(x-xbar)

77                    40 5.1         1.3 6.63

63                     42 -8.9            3.3 -29.37

79                     37 7.1            -1.7 -12.07

86                     47 14.1            8.3 117.03

51                    25 -20.9  -13.7 286.33

78                     44 6.1            5.3 32.33

83                      41 11.1            2.3 25.53

90                     48 18.1            9.3 168.33

65                     35 -6.9           -3.7 25.53

47                    28 -24.9 -10.7 266.43

Covariance=\frac{sum[(y-ybar)(x-xbar)]}{n-1}

Co-variance=886.7/(10-1)

Co-variance=886.7/9

Co-variance=98.5222

The co-variance computed using excel function COVARIANCE.S(B1:B11,A1:A11) where B1:B11 contains Time x column and A1:A11 contains Marks y column. The resulted co-variance is 98.52222.

b)

The correlation coefficient is computed as

Correlation coefficient=r=\frac{sum[(y-ybar)(x-xbar)]}{\sqrt{sum[(x-xbar)]^2sum[(y-ybar)]^2} }

(y-ybar)^2 (x-xbar)^2

26.01        1.69

79.21       10.89

50.41             2.89

198.81       68.89

436.81       187.69

37.21       28.09

123.21        5.29

327.61        86.49

47.61         13.69

620.01         114.49

sum(y-ybar)^2=1946.9

sum(x-xbar)^2=520.1

Correlation coefficient=r=\frac{886.7}{\sqrt{520.1(1946.9)} }

Correlation coefficient=r=\frac{886.7}{\sqrt{1012582.69} }

Correlation coefficient=r=\frac{886.7}{1006.2717 }

Correlation coefficient=r=0.881

The correlation coefficient computed using excel function CORREL(A1:A11,B1:B11) where B1:B11 contains Time x column and A1:A11 contains Marks y column. The resulted correlation coefficient is 0.881.

c)

The correlation coefficient and co-variance shows that there is positive association between marks and study time. The correlation coefficient suggest that there is strong positive association between marks and study time. It means that as the study time increases the marks of student also increases and if the study time decreases the marks of student also decreases.

The excel file is attached on which all the related work is done.

Download xlsx
7 0
3 years ago
A5= -68 and r=-0.5 ; find a1
fiasKO [112]

Answer:

yes

Step-by-step explanation:

yes

3 0
3 years ago
Other questions:
  • {1, 4, 9, 4, 10, 8, 42} What is the best measure of center for this data set?
    5·2 answers
  • Two points sit on a line with the following coordinates p(2,2) and Q(3,7) which is the distance from p to q
    10·1 answer
  • A trapezoid has an altitude of 14 cm. Its parallel sides measure 5 and 8 cm, respectively. What is its area?
    11·1 answer
  • Craig charges $25 for each lawn he mows. He also charges $25 for each dog he walks. Last week he mowed 6 lawns and walked some d
    5·1 answer
  • Which of these sentences best describes verbal irony?
    13·2 answers
  • ASAP
    6·2 answers
  • What is the slope of the line for (-9, -3) (-7, -5)
    10·1 answer
  • A bag with 1/4 pounds of raisins will be used to fill snack cups with 1/32 pounds of raisins each. How many snack cups can be fi
    13·1 answer
  • Someone please help and thank you
    5·2 answers
  • -2x + y =5<br><br> SOLVE FOR Y. THEN MAKE A TABLE OF ANSWERS
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!